Hello, I recived a Line 6 express for christmas (2008) and after about 3 months of light use the wah pedal bagan to squeak when I used it, it now squeaks rarther loud now, not only when I use it, but when I apply pressure to change from volume to wah, can I put some lubricant on it or, will it have to be repaired by a pro? I havn't dropped / damaged it. If I can put lubricant on it what lubricant should I use and where should I put it?